Internally, Change management is about the version of a complied object that is being used and whether the newer version should be used instead. This is also version control, code management as well. You are basically controlling which version of a code piece is being used.

Externally, CM is the control that prevents or allows a solution to be deployed to the production environment. the solution is deployed using Release management_________________John Hardesty
ITSM Manager's Certificate (Red Badge)